Sunday 25 November 2012

RENEWABLE AND NON-RENEWABLE ENERGY SOURCES

1. The energy we use every day comes from two major sources: renewable energy and non-renewable energy sources.
2. Renewable energy is energy that can be replenished. Such energy sources are always available.
3. Non-renewable energy is energy that cannot be replenished when it is used up.

Renewable Energy Sources

The Sun 


  • Solar energy comes directly from the Sun.
  • Solar energy is used to heat water in homes and to produce electrical energy.

Wind


  • Wind is moving air. It has kinetic energy.
  • Windmills transform this energy into electrical energy.
Water



  • Energy in water is used to generate electricity in hydroelectric power stations.
Biomass
  • Biomass energy is obtained from plant and animal waste materials.
  • The burning of biomass fuels releases heat energy and generates electrical energy.
Non-Renewable Energy Sources

                                                                             Coal                                                                                     
                                                                   
                                                                          Natural gas                      
                                                                       
                                                                           Petroleum
                                                                                                    
Nuclear reactor
  •  Fossil fuels such as coal, petroleum and natural gas are burnt to produce heat energy for cooking and    moving vehicles and machines.
  • These fuels can also be used to generate electricity.
  • Nuclear energy is produced in nuclear reactors.
  • Nuclear energy is used to generate electrical energy and power submarines, ships and satellites.

4. Renewable energy sources are better than non-renewable energy sources because
  • they cannot be used up
  • there is little or no pollution

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